Combi boiler benefits, costs and savings

Combi boilers are perhaps the most common type of new boiler installed, favoured by heating engineers and homeowners alike due to their compact size, ease of use and quick and easy installation. In fact more than half of all new boilers installed today are a combi.


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Also known as combination boilers, with this type of boiler you’ll benefit from hot water and central heating on demand. A high efficiency water heater and a central heating boiler wrapped up in one compact unit, space saving combination boiler systems remove the need for a hot water tank, which helps to keep costs down.

Combi boilers are available in three sizes: 24kW to 27kW, 28kW to 34kW and 35kW to 42kW. The size of system will depend on the size of your home; or more specifically, the number of bedrooms and bathrooms. Combi boilers are especially ideal for smaller houses and flats. If you have more than one bathroom or shower they might not be the best option. You can only run one hot tap at a time and the water flow rate is lower compared to other boiler types.

If you live in a small house or a flat with up to 10 average size radiators a 24kW to 27kW condensing boiler replacement should meet your needs. A 3-4 bed house with up to 15 radiators will be better suited to a 28kW to 34kW combi boiler, while a large house with up to 20 radiators will require a 35kW to 42kW size boiler.

How much does it cost to install a combination boiler?

Costs will depend on a number of factors, including the size of the boiler, whether radiators need replacing and the length of the flue to vent waste gases. It will cost more if you need the cylinder in the bathroom removing, or if the engineer has to remove an old water tank from the loft. It means a bigger job and more work for the installer.

You’re looking at an average cost of £2,300 to install a new condensing combi boiler, including VAT and installation according to the Energy Saving Trust.

Below you’ll find some typical direct from the manufacturer unit only prices for popular brands:

Baxi – £700 to £1,200
Glow-worm – £560 to £1,360
Ideal – £600 to £1,000
Vaillant – £610 to £1,200
Worcester – £730 to £1,010

According to a Which? survey a new boiler replacement in the same location will typically cost around £600, but this can be as much as £1,800 if the boiler needs moving to a different area. Installation costs will also depend on the area, and the company carrying out the installation. For example expect to pay more if you instruct a heating engineer employed by one of the ‘Big Six’ energy firms, compared to a smaller independent Gas Safe Registered engineer.

Savings and benefits

  • A reduction in energy bills
  • Instant heating and hot water
  • Compact “cupboard fit” design – small enough to fit in a kitchen cupboard
  • Quick and easy to install
  • User friendly controls
  • No tank in the loft
  • No storage cylinder
  • Lower carbon dioxide emissions

Modern condensing combi boilers are designed to convert at least 90% of fuel into heat, so they are very efficient and will help you save money on your energy bills – up to as much as £310 a year if you’re upgrading from an old G rated boiler.

Make sure you get the best possible price for your new combi boiler by obtaining free quotes from Boiler Guide’s approved Gas Safe Registered heating professionals.  Once you’ve received your free quotes you can choose the quote which best suits your needs.

Complete the online quote form to get up to three no obligation boiler quotes. Remember the cheapest quote isn’t always the best quote: it may be worth paying more for a better quality boiler backed up by a lengthy warranty.


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